/Engine/Source/Runtime/Interchange/Core/Public/Types/AttributeStorage.h
This function fill the OutGuid with the hash of the specified attribute. Return true if the attribute exist and the OutGuid was assign, return false otherwise without touching the OutGuid.
bool GetAttributeHash ( const [FAttributeKey](API\Runtime\InterchangeCore\Types\FAttributeKey) & ElementAttributeKey, [FGuid](API\Runtime\Core\Misc\FGuid) & OutGuid ) const